<?php
    $num1=$_GET['a1'];
    $num2=$_GET['a2'];
    $num3=$_GET['a3'];
if($num2=="+")
    {
        echo $num1+$num3;
    }
    else if ($num2=="-")
    {
        echo $num1-$num3;
    }
    else if ($num2=="*")
    {
        echo $num1*$num3;
    }
    else if ($num2=="/")
    {
        echo $num1/$num3;
    }


